CN108274214B - Automatic CPU picking and placing method - Google Patents

Abstract

the invention discloses a method for automatically taking and placing a CPU, which sequentially comprises the following steps: pressing down, guiding into a CPU mounting seat, accurately positioning, locking, pressurizing, testing a mainboard, and loosening and resetting; the automatic CPU taking and placing method disclosed by the invention can be used for quickly, efficiently and accurately installing the CPU on the CPU installation seat on the mainboard, is accurate in butt joint and uniform in stress, improves the working efficiency during mainboard testing, and reduces the labor cost.

Description

Automatic CPU picking and placing method

[ technical field ] A method for producing a semiconductor device

The application is a divisional application of patent applications with the application date of 2016, 8, 31 and the application number of 201610796652.X, and the name of the invention is 'an automatic CPU taking and placing module and an automatic CPU taking and placing method'.

[ background of the invention ]

The computer mainboard needs to be tested before leaving the factory, a CPU needs to be installed on a CPU installation seat on the mainboard, the CPU needs to be manually installed on the mainboard by a person in the traditional testing process, then the testing is carried out, and the traditional manual operation mode is low in efficiency; with the improvement of automation level, some devices capable of automatically installing the CPU on the CPU installation seat appear, the Chinese invention patent discloses an automatic CPU pick-and-place machine (publication number: CN103729277B) for testing a computer mainboard, which can automatically install the CPU on the mainboard and then test.

For example, the following problems exist when the Intel LGA3647 server CPU is installed on a mainboard for mainboard test:

1. the number of the CPU contact points is 3647, when the CPU automatic positioning device works, the contact points of each CPU need to be in good contact with the contact points on the CPU mounting base, namely the bottom surface of the CPU is completely matched with the CPU mounting base, but in reality, a mainboard (CPU mounting base) cannot be kept horizontal by 100%, and the mainboard (CPU mounting base) may incline at an angle, so that the CPU pick-and-place module needs to be capable of self-adaptively adjusting accurate positioning according to the actual position of the mainboard (CPU mounting base), and if some points are not in contact, the CPU automatic positioning device cannot normally work;

2. the contact points of the CPUs are 3647, and the contact force between each CPU contact point and the contact point on the CPU mounting seat needs to be uniform, so that the CPU taking and placing module is required to be capable of adaptively adjusting the position and also required to be capable of adaptively carrying out loading pressure after adjustment;

3. the volume of the automatic fetching machine of the CPU is small, otherwise, the installation of other equipment (such as a memory bank) on the mainboard is influenced;

4. when the heat dissipation device works, a large amount of heat is generated, and the heat dissipation device needs to be dissipated in time, otherwise the normal work cannot be realized.

the invention is provided aiming at the defects of the prior art.

[ summary of the invention ]

The technical problem to be solved by the invention is to provide an automatic CPU taking and placing module, which can self-adaptively adjust the relative position of a CPU and a CPU mounting seat when the CPU is mounted, so that the CPU and the CPU mounting seat are completely matched, and the top pressure is always vertical to the plane of the CPU when the pressure is loaded, so that the contact force between the CPU and the CPU mounting seat is uniform.

in order to solve the above technical problems, the present invention comprises: the self-adaptive positioning device comprises a rack, a sliding connection seat, a first driving device, a CPU clamping assembly, a self-adaptive positioning device and a locking device, wherein the sliding connection seat is connected with the rack in a sliding mode and can slide on the rack in the vertical direction; the first driving device is arranged on the rack and used for driving the sliding connecting seat to move along the vertical direction; the CPU clamping assembly is connected with the sliding connecting seat and moves up and down along with the sliding connecting seat, and is used for clamping the CPU; the self-adaptive positioning device is arranged between the sliding connection seat and the CPU clamping component, so that the CPU clamping component can self-adaptively adjust the relative position of the CPU and the CPU mounting seat, and the CPU mounting seat are accurately butted; the locking device is arranged on the sliding connection seat and used for fixing the CPU clamping assembly on the mainboard.

According to the automatic CPU taking and placing module, a lever jacking device for jacking the CPU clamping assembly is arranged between the output end of the first driving device and the sliding connecting seat, and the first driving device comprises a screw rod rotationally connected to the rack and a first motor installed on the rack and used for driving the screw rod to rotate; the lever top pressure device contain the transition connecting plate of connection at the sliding connection seat upside and connect the pressure head subassembly at the transition connecting plate upside, the pressure head subassembly on be equipped with pressure sensor, the pressure head subassembly contain the seat of honour and connect the lower of seat of honour bottom, the seat of honour contain with lead screw sliding connection's hollow cylinder and fixed connection at the connecting block of hollow cylinder lower part, lower seat bottom be equipped with the semicircle ball at roof pressure transition connecting plate center, transition connecting plate bottom be equipped with two and use transition connecting plate central axis as the guide force post that is used for roof pressure CPU centre gripping subassembly of symmetry axis.

The automatic CPU taking and placing module is characterized in that a first reset mechanism and a second reset mechanism which reset after a pressure head assembly releases pressure are respectively arranged between the connecting block and the transition connecting plate and between the transition connecting plate and the sliding connecting seat, the first reset mechanism comprises four first through holes which are arranged on the connecting block, four first bolts are connected onto the four first through holes, the lower ends of the four first bolts are fixedly connected with the transition connecting plate in a threaded manner, and four first springs for separating the connecting block from the transition connecting plate are sleeved on the four first bolts.

according to the automatic CPU taking and placing module, the lower side of the sliding connecting seat is connected with the middle connecting plate, and a third reset mechanism is arranged between the middle connecting plate and the sliding connecting seat; the self-adaptive positioning device comprises two groups of follow-up platform components connected to a middle connecting plate, the CPU clamping component is movably connected to the middle connecting plate through the two groups of follow-up platform components, each follow-up platform component comprises a center follow-up column connected to the upper portion of the CPU clamping component and a ring sleeve connected to the bottom of the middle connecting plate, a disc is formed by outwards extending the middle portion of the center follow-up column along the outer wall of the center follow-up column, an inner ring is formed by inwards extending the bottom of the ring sleeve along the inner wall of the ring sleeve, the disc on the center follow-up column is clamped between the middle connecting plate and the inner ring to support the CPU clamping component, the outer diameter of the disc on the center follow-up column is smaller than the inner diameter of the ring sleeve, and the two guide columns respectively press the upper portion of the center follow-up column to compress the CPU clamping component.

according to the automatic CPU taking and placing module, balls and ball retaining blocks for limiting the movement of the balls are respectively arranged between the upper surface of the disc and the lower surface of the middle connecting plate and between the lower surface of the disc and the upper surface of the inner circular ring.

As above an automatic module of getting of CPU get, locking device contain two sets of drive mechanism who sets up respectively in sliding connection seat both sides, two sets of the drive mechanism output be connected with respectively with the mainboard fixed frame on the nut that the screw matches, the frame on be equipped with the second motor, second motor output shaft have two electromagnetic clutches, two electromagnetic clutch's output link to each other with drive nut's rotation through two flexible transmission shafts and two sets of drive mechanism respectively in order to lock or loosen CPU centre gripping subassembly.

as above an automatic module of putting of getting of CPU, drive mechanism contain and rotate the transmission shaft of connection on sliding connection seat along vertical direction, the nut setting at the lower extreme of transmission shaft, transmission shaft upper end be equipped with the retaining ring that prevents the transmission shaft and translocation, retaining ring and sliding connection seat between be equipped with footstep bearing, the transmission shaft on still be equipped with along with transmission shaft pivoted worm wheel, sliding connection seat on rotate and be connected with the rotatory worm of drive worm wheel, the worm pass through the output of flexible transmission shaft and electromagnetic clutch and be connected.

The automatic CPU taking and placing module comprises a CPU fixing seat and radiating fins, wherein the CPU fixing seat is in contact with the upper surface of a CPU, the radiating fins are connected to the upper surface of the CPU fixing seat, two radiating fans are respectively arranged on two sides of the CPU clamping component, a closed radiating channel is formed between the two radiating fans, and the closed radiating channel comprises a plurality of radiating through holes and radiating gaps, the radiating through holes are formed in the CPU fixing seat and are arranged along the direction of the closed radiating channel, and the radiating gaps are formed in the radiating fins and are arranged along the direction of the closed radiating channel.

As above an automatic module of getting of CPU get, CPU fixing base outside be equipped with the CPU locating rack, the CPU locating rack on be equipped with a plurality of location column bases, it is a plurality of the CPU mount pad outside profile matching of location column base and mainboard, the CPU fixing base on be equipped with the constant head tank that is used for placing CPU, the constant head tank side be equipped with the breach, the CPU locating rack on articulated grip block that has, the grip block end pass breach centre gripping CPU's side, the CPU fixing base on be equipped with the rotatory stopper of restriction grip block.

the invention also provides a method for automatically taking and placing the CPU, which is used for automatically installing the CPU when the mainboard is arranged below the CPU automatic taking and placing module of the mainboard testing machine, and comprises the following steps:

a. Pressing: the first driving device drives the lever jacking device, the sliding connecting seat, the self-adaptive positioning device and the CPU clamping assembly to move downwards;

b. importing a CPU mounting seat: the self-adaptive positioning device leads the CPU clamping component to be automatically led into the mainboard CPU mounting seat so that the CPU enters the CPU mounting seat;

c. Accurate plane positioning: the lever jacking device enables the bottom surface of the CPU to be completely attached to the CPU mounting seat, so that each contact on the bottom surface of the CPU is completely contacted with the contact of the CPU mounting seat;

d. Locking: the locking device is screwed with a screw on the main board to fix the sliding connecting seat with the main board;

e. pressurizing: the lever jacking device continues to push down the CPU clamping assembly, and stops pushing down when the pressure reaches a preset value;

f. testing the main board: powering on the main board, testing the main board, and powering off after the test is finished;

g. loosening and resetting: the locking device is loosened from the screws on the main board, and the first motor enables the lever jacking device, the sliding connection seat, the self-adaptive positioning device and the CPU clamping assembly to move upwards for resetting.

compared with the prior art, the automatic CPU taking and placing method provided by the invention can be used for quickly, efficiently and accurately installing the CPU on the CPU installation seat on the mainboard, thereby improving the efficiency of mainboard testing and reducing the labor cost; the automatic CPU taking and placing module provided by the invention has the following advantages:

1. the CPU clamped by the CPU clamping assembly can enter the CPU mounting seat under the guidance of the positioning column foot, and the CPU is self-adaptively adjusted to be completely matched with the CPU mounting seat according to the actual position of the CPU mounting seat under the action of the self-adaptive positioning device, so that each contact on the CPU is completely matched with each contact on the CPU mounting seat.

2. The lever pressing device adopts the principle of an equiarm lever, when the CPU clamping component inclines, two force guide columns which take the symmetrical axis of the transition connecting plate as the center on the transition connecting plate always press the CPU clamping component, and the pressure head component presses the center of the transition connecting plate, so that the force applied to the CPU clamping component by the two force guide columns is always the same, the pressing force is always vertical to the CPU, and the contact force between the CPU and the CPU mounting seat is always uniform.

3. Two cooling fans are arranged on two sides of the CPU clamping assembly, one fan is used for exhausting air, and the other fan is used for blowing air, so that the cooling effect can be enhanced, and the size of the CPU clamping assembly is reduced.

4. The invention has the advantages of compact structure, reasonable layout, high automation degree and high working efficiency.

[ description of the drawings ]

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic mechanical diagram of a motherboard tested in the present invention;

FIG. 3 is one of the exploded views of the present invention;

FIG. 4 is a second exploded view of the present invention;

FIG. 5 is a third exploded view of the present invention;

FIG. 6 is an enlarged view of section A marked in FIG. 5;

FIG. 7 is an exploded view of the lever biasing device, adaptive positioning device and CPU clamping assembly of the present invention;

FIG. 8 is an exploded view of the follower platform assembly of the present invention;

FIG. 9 is a perspective cross-sectional view of the lever biasing device, the adaptive positioning device and the CPU clamping assembly of the present invention after they are connected;

FIG. 10 is an enlarged view of portion B labeled in FIG. 9;

FIG. 11 is an exploded view of the CPU clamp assembly of the present invention;

FIG. 12 is a perspective view of the CPU fixing base and the CPU positioning frame of the present invention;

FIG. 13 is a top view of the CPU fixing base and the CPU positioning frame of the present invention;

fig. 14 is a full sectional view taken along the direction C-C in fig. 13.

[ detailed description ] embodiments

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

as shown in fig. 1 to 5 in the explanatory drawings, the present embodiment includes: the device comprises a frame 1, a sliding connection seat 2, a first driving device 6, a CPU clamping assembly 4, a self-adaptive positioning device 3 and a locking device 7; the sliding connection seat 2 is connected with the rack 1 in a sliding manner and can slide on the rack 1 along the vertical direction; the first driving device 6 is arranged on the frame 1 and used for driving the sliding connection seat 2 to move along the vertical direction; the CPU clamping component 4 is connected with the sliding connection seat 2 and moves up and down along with the sliding connection seat 2 and is used for clamping the CPU 801; the self-adaptive positioning device 3 is arranged between the sliding connection seat 2 and the CPU clamping component 4, so that the CPU clamping component 4 can self-adaptively adjust the relative positions of the CPU801 and the CPU mounting seat 803, and the CPU801 and the CPU mounting seat 803 are precisely butted; the locking device 7 is arranged on the sliding connection seat 2 and is used for fixing the CPU clamping component 4 on the main board 802. The CPU801 is clamped on the CPU clamping assembly 4, the CPU clamping assembly 4 is connected on the sliding connection seat 2 through the adaptive positioning device 3 so that the CPU can be precisely butted with the CPU mounting seat 803, and then the CPU801 and the CPU mounting seat are matched under the driving of the first driving device 6.

as shown in fig. 3, 5, 6 and 7, a lever pressing device 5 for pressing the CPU clamping assembly 4 is disposed between the output end of the first driving device 6 and the sliding connection seat 2, and the first driving device 6 includes a screw 61 rotatably connected to the frame 1 and a first motor 62 mounted on the frame 1 for driving the screw 61 to rotate; the lever jacking device 5 comprises a transition connecting plate 51 connected to the upper side of the sliding connection seat 2 and a pressure head assembly 52 connected to the upper side of the transition connecting plate 51, the pressure head assembly 52 is provided with a pressure sensor, the pressure head assembly 52 comprises an upper seat 521 and a lower seat 522 connected to the bottom of the upper seat 521, the upper seat 521 comprises a hollow cylinder 5211 in sliding connection with the screw rod 61 and a connecting block 5212 fixedly connected to the lower part of the hollow cylinder 5211, the bottom of the lower seat 522 is provided with a semi-sphere 523 jacking the center of the transition connecting plate 51, the bottom of the transition connecting plate 51 is provided with two guide columns 511 which take the central axis of the transition connecting plate 51 as a symmetric axis and are used for jacking the CPU clamping assembly 4, and the lower ends of the guide columns 511 are also of a semi-sphere structure, in the embodiment, the transition connecting plate 51 is provided; similarly, it is easy for those skilled in the art to think that the plurality of force guiding pillars 511 are disposed on the transition connecting plate 51, and the plurality of force guiding pillars 511 are uniformly distributed on a circle with the transition connecting plate 51 as the center, so that the same technical effect can be achieved, and the detailed description of the embodiment is omitted.

When the CPU clamping assembly 4 is tilted at an angle, the CPU clamping assembly 4 is necessarily tilted under the action of the adaptive positioning device 3 (in order to make the CPU801 and the CPU mounting seat 803 completely fit), but the pressure head assembly 52 connected to the screw rod 61 always moves in the vertical direction, and cannot directly provide a force perpendicular to the CPU 801. According to the invention, the semicircle 523 at the bottom of the pressure head component 52 presses against the center of the transition connecting plate 51, and the transition connecting plate 51 can be adaptively adjusted according to the position of the CPU clamping component 4, so that two force guide columns 511 on the transition connecting plate 51 press against the CPU clamping component at the same time; the pressure head assembly 52, the transition connecting plate 51 and the two force guiding columns 511 form an equal-arm lever, even if the transition connecting plate 51 is inclined, the output forces of the two force guiding columns 511 are the same and are perpendicular to the plane of the CPU801, and therefore the uniform stress of the CPU801 and the CPU mounting seat 803 is guaranteed.

as shown in fig. 9 and 10, in order to make the two force guiding pillars 511 on the transition connection plate 51 always press against the CPU clamping assembly 4 and reset after completing one operation, a first resetting mechanism 53 and a second resetting mechanism 54 which reset after the pressure of the pressure head assembly 52 is released are respectively arranged between the connection block 5212 and the transition connection plate 51 and between the transition connection plate 51 and the sliding connection seat 2, the first resetting mechanism 53 comprises four first through holes 531 arranged on the connection block 5212, four first bolts 532 are connected to the four first through holes 531, the lower ends of the four first bolts 532 are in threaded connection with the transition connection plate 51, and the four first bolts 532 are sleeved with first springs 533 which separate the connection block 5212 from the transition connection plate 51. Specifically, here are described: the diameter of each bolt is smaller than that of each through hole, so that the transition connecting plate 51 can swing within a certain range, and the position of the transition connecting plate 51 is adaptively adjusted, so that the two force guide columns 511 are always perpendicular to the plane where the CPU801 is located when pressure is loaded.

as shown in fig. 7 to 10, in order to make the adaptive positioning device 3 swing within a certain range, the lower side of the sliding connection holder 2 is connected with an intermediate connection plate 21, a third reset mechanism 55 is arranged between the intermediate connection plate 21 and the sliding connection holder 2, and the structures of the third reset mechanism 55 and the first reset mechanism 53 are the same and will not be repeated here; the self-adaptive positioning device 3 comprises two groups of follow-up platform components 31 connected to the middle connecting plate 21, the CPU clamping component 4 is movably connected to the middle connecting plate 21 through the two groups of follow-up platform components 31, each follow-up platform component 31 comprises a central follow-up column 311 connected to the upper part of the CPU clamping component 4 and a circular ring sleeve 312 connected to the bottom part of the middle connecting plate 21, the middle part of the central follow-up column 311 extends outwards along the outer wall thereof to form a circular disc 3111, the bottom part of the circular ring sleeve 312 extends inwards along the inner wall thereof to form an inner circular ring 3121, the circular disc 3111 on the central follow-up column 311 is clamped between the middle connecting plate 21 and the inner circular ring 3121 to support the CPU clamping component 4, the outer diameter of the circular disc 3111 on the central follow-up column 311 is smaller than the inner diameter of the circular ring sleeve 312, so that the central follow-up column 311 can move in the circular ring sleeve 312, and the middle connecting plate 21 and a third reset, that is, the CPU clamping assembly 4 can be adaptively adjusted according to the position of the CPU mounting seat 803, thereby ensuring complete matching between the CPU801 and the CPU mounting seat 803. The two force-guiding columns 511 respectively press the upper part of the central follower column 311 to press the CPU clamping assembly 4.

As shown in fig. 8, in order to make the central follower post 311 move more smoothly in the ring housing 312, balls 32 and ball holding blocks 33 for restricting movement of the balls 32 are respectively provided between the upper surface of the disc 3111 and the lower surface of the intermediate link plate 21 and between the lower surface of the disc 3111 and the upper surface of the inner ring 3121.

as shown in fig. 1 and 3, the locking device 7 includes two sets of transmission mechanisms 71 respectively disposed at two sides of the sliding connection seat 2, output ends of the two sets of transmission mechanisms 71 are respectively connected with nuts 72 matched with screws 805 on an upper fixed frame 804 of a main board 802, a second motor 73 is disposed on the frame 1, an output shaft of the second motor 73 is connected with two electromagnetic clutches 74, output ends of the two electromagnetic clutches 74 are respectively connected with the two sets of transmission mechanisms 71 through two flexible transmission shafts 75 to drive the nuts 72 to rotate for locking or releasing; in the embodiment, a scheme that a second motor 73 drives two electromagnetic clutches 74 is adopted, one reason is that two screws 805 are arranged on a main board 802 and need to be locked respectively, and the other reason is that thread starting parts of the two screws 805 are different, when the nuts 72 are screwed into the screws 805, the two nuts 72 cannot be synchronized, and the two groups of electromagnetic clutches 74 can be used for controlling the two nuts to be screwed or loosened respectively according to actual conditions; in addition, the soft rotating shaft 75 is used for torque transmission, complex transmission components in the middle can be reduced, transmission efficiency is improved, and the size of the whole machine is reduced.

as shown in fig. 3, 5 and 6, the transmission mechanism 71 includes a transmission shaft 711 rotatably connected to the sliding connector holder 2 in a vertical direction, a nut 72 is disposed at a lower end of the transmission shaft 711, a retainer ring 712 for preventing the transmission shaft 711 from being dislocated is disposed at an upper end of the transmission shaft 711, a thrust bearing 713 is disposed between the retainer ring 712 and the sliding connector holder 2, a worm wheel 714 rotating along with the transmission shaft 711 is further disposed on the transmission shaft 711, a worm 715 for driving the worm wheel 714 to rotate is rotatably connected to the sliding connector holder 2, and the worm 715 is connected to an output end of the electromagnetic clutch 74 through a.

As shown in fig. 9 and 11, the CPU clamping assembly 4 includes a CPU fixing seat 41 contacting with the upper surface of the CPU801 and a heat dissipating fin 42 connected to the upper surface of the CPU fixing seat 41, two sides of the CPU clamping assembly 4 are respectively provided with a heat dissipating fan 43, air outlet positions of the two heat dissipating fans 43 are the same, a closed heat dissipating channel 44 is formed between the two heat dissipating fans 43, the closed heat dissipating channel 44 includes a plurality of heat dissipating through holes 444 arranged on the CPU fixing seat 41 and arranged along the direction of the closed heat dissipating channel 44 and a heat dissipating gap 421 arranged on the heat dissipating fin 42 and arranged along the direction of the closed heat dissipating channel 44.

as shown in fig. 12 to 14, a CPU positioning frame 45 is disposed on the outer side of the CPU fixing seat 41, a plurality of positioning pins 46 are disposed on the CPU positioning frame 45, and the plurality of positioning pins 46 are matched with the outer contour of the CPU mounting seat 803 of the motherboard 802 for guiding the CPU801 clamping assembly into the CPU mounting seat 803; the CPU fixing seat 41 is provided with a positioning groove 411 for placing the CPU801, the side edge of the positioning groove 411 is provided with a notch 4112, the CPU positioning frame 45 is hinged with a clamping block 451, the tail end of the clamping block 451 penetrates through the notch 4112 to clamp the side edge of the CPU801, and the CPU fixing seat 41 is provided with a limiting block 452 for limiting the rotation of the clamping block 451.

the embodiment further provides a method for automatically taking and placing a CPU, which automatically installs the CPU when the motherboard 802 is placed below the CPU automatic taking and placing module of the motherboard testing machine, and the method comprises the following steps:

a. Pressing: the first driving device 6 drives the lever jacking device 5, the sliding connection seat 2, the self-adaptive positioning device 3 and the CPU clamping component 4 to move downwards;

b. importing a CPU mounting seat: the adaptive positioning device 3 leads the CPU clamping component 4 into the CPU mounting seat 803 of the mainboard 802 automatically, so that the CPU801 enters the CPU mounting seat 803;

c. Accurate plane positioning: the lever jacking device 5 makes the bottom surface of the CPU completely attached to the CPU mounting seat 803, so that each contact on the bottom surface of the CPU801 completely contacts with the contact of the CPU mounting seat 803;

d. Locking: the locking device 7 is screwed with the screw 805 on the main board 802, so that the sliding connection seat 2 is fixed with the main board 802;

e. Pressurizing: the lever jacking device 5 continues to push down and jack the CPU clamping assembly 4, and stops pushing down when the pressure reaches a preset value;

f. Testing the main board: powering on the main board, testing the main board, and powering off after the test is finished;

g. loosening and resetting: the locking device 7 is loosened from the screw 805 on the main board 802, and the first motor 62 moves the lever pressing device 5, the sliding connection seat 2, the adaptive positioning device 3 and the CPU clamping assembly 4 upward to reset.

by adopting the method, the CPU801 can be automatically installed in the CPU installation seat 803, the butt joint is accurate, the stress is uniform, and the working efficiency in the mainboard test is improved.

Claims (1)

1. an automatic pick-and-place method for a CPU is characterized in that an automatic pick-and-place module for picking and placing the CPU comprises:

a frame (1);

the sliding connection seat (2) is connected with the rack (1) in a sliding manner and can slide on the rack (1) along the vertical direction;

The first driving device (6) is arranged on the rack (1) and used for driving the sliding connection seat (2) to move along the vertical direction;

the CPU clamping component (4) is connected to the sliding connection seat (2), moves up and down along with the sliding connection seat (2) and is used for clamping the CPU (801);

The self-adaptive positioning device (3) is arranged between the sliding connection seat (2) and the CPU clamping component (4), so that the CPU clamping component (4) can self-adaptively adjust the relative position of the CPU (801) and the CPU mounting seat (803), and the CPU (801) and the CPU mounting seat (803) are precisely butted;

The locking device (7) is arranged on the sliding connection seat (2) and used for fixing the CPU clamping assembly (4) on the main board (802);

A lever jacking device (5) for jacking the CPU clamping assembly (4) is arranged between the output end of the first driving device (6) and the sliding connecting seat (2), and the first driving device (6) comprises a screw rod (61) rotatably connected to the rack (1) and a screw rod

A first motor (62) which is arranged on the frame (1) and drives the screw rod (61) to rotate; the lever jacking device (5) comprises a transition connecting plate (51) connected to the upper side of the sliding connection seat (2) and a pressure head assembly (52) connected to the upper side of the transition connecting plate (51), a pressure sensor is arranged on the pressure head assembly (52), the pressure head assembly (52) comprises an upper seat (521) and a lower seat (522) connected to the bottom of the upper seat (521), the upper seat (521) comprises a hollow cylinder (5211) in sliding connection with the screw rod (61) and a connecting block (5212) fixedly connected to the lower part of the hollow cylinder (5211), a semi-sphere (523) jacking the center of the transition connecting plate (51) is arranged at the bottom of the lower seat (522), and two force guide columns (511) which are used for jacking the CPU clamping assembly (4) and take the central axial direction of the transition connecting plate (51) as a symmetrical axis are arranged at the bottom of the transition connecting plate (51); an intermediate connecting plate (21) is connected to the lower side of the sliding connecting seat (2), and a third reset mechanism (55) is arranged between the intermediate connecting plate (21) and the sliding connecting seat (2); the self-adaptive positioning device (3) comprises two groups of follow-up platform components (31) connected to a middle connecting plate (21), the CPU clamping component (4) is movably connected to the middle connecting plate (21) through the two groups of follow-up platform components (31), each follow-up platform component (31) comprises a center follow-up column (311) connected to the upper part of the CPU clamping component (4) and a circular ring sleeve (312) connected to the bottom of the middle connecting plate (21), the middle part of the center follow-up column (311) outwards extends along the outer wall of the center follow-up column to form a circular disc (3111), the bottom of the circular ring sleeve (312) inwards extends along the inner wall of the circular ring sleeve to form an inner circular ring (3121), the circular disc (3111) on the center follow-up column (311) is clamped between the middle connecting plate (21) and the inner circular ring (3121) to support the CPU clamping component (4), the outer diameter of the circular disc (3111) on the center follow-up column (311) is smaller than the inner diameter of the circular ring sleeve (312), the two force guide columns (511) respectively press the upper parts of the central follow-up columns (311) to tightly press the CPU clamping assembly (4);

When a mainboard (802) is arranged below a CPU automatic pick-and-place module of a mainboard testing machine, the CPU is automatically installed, and the method for automatically picking and placing the CPU comprises the following steps:

a. pressing: the first driving device (6) drives the lever jacking device (5), the sliding connecting seat (2), the self-adaptive positioning device (3) and the CPU clamping assembly (4) to move downwards;

b. Importing a CPU mounting seat: the self-adaptive positioning device (3) leads the CPU clamping assembly (4) to be automatically led into a CPU mounting seat (803) of the mainboard (802) so that the CPU (801) enters the CPU mounting seat (803);

c. accurate plane positioning: the lever jacking device (5) enables the bottom surface of the CPU to be completely attached to the CPU mounting seat (803), so that each contact on the bottom surface of the CPU (801) is completely contacted with the contact of the CPU mounting seat (803);

d. Locking: the locking device (7) is screwed with a screw (805) on the main board (802) to fix the sliding connection seat (2) with the main board (802);

e. pressurizing: the lever jacking device (5) continues to push down the CPU clamping assembly (4), and stops pushing down when the pressure reaches a preset value;

f. Testing the main board: powering on the main board, testing the main board, and powering off after the test is finished;

g. Loosening and resetting: the locking device (7) is loosened from the screw (805) on the main board (802), and the first motor (62) enables the lever jacking device (5), the sliding connection seat (2), the self-adaptive positioning device (3) and the CPU clamping assembly (4) to move upwards for resetting.